Retainer for drill steels



Aug. 13, 1929. I J, E; RENFER 1,724,620

RETAINER FOR DRILL .STEELS Filed, March 21, 192.8

| l UIN- 247/ @hum/gto@ Patented Aug. 13, 1929.

y uiten 'sra JOHN E. EENEER, OE CLEVELAND, OHIO, AssiGNOE To TEE CLEVELAND ROOK DRILL COMPANY, OE CLEVELAND, OHIO.

RETAINER FOR DRILL STEELS.

The present invention is directed to 111iprovements in retainers for collared drill steels used in connection with percussive drills. Y

The primary object of the invention is to provide a device offthis character which can be easily and quickly attached to or removed fromthe front head of the drill, and is readily adjustable to retain the drill steel or permit the release thereof.

.Another object of the invention is to provide a retainer of this nature which is formed from a single length of suitable gage stock, the inherent resiliency thereof being such that the shock incident to the drill steel collar striking theretainer will be effectively absorbed.

Another object of the invention is to provide novel cooperative means between the front head of the drill and the retainer to hold the latter in its open or inoperative position, and in its operative position.

While the drawing illustrates a preferred embodiment of the invention it is to be understood that in adapting the means to meet specic needs and requirements the design may be varied and such other changes in the minor details of construction may be resorted to within the scope of the invention as claimed, Without departing from the spirit thereof.

For a full understanding of the invention and the merits thereof, reference is to be had to the following description and the drawing hereto attached, in which,-

Figure 1 is a side view.

Figure 2 is a top plan view, partly in section.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawing by like reference characters.

Referring to the drawing, 1 designates the front head of a drill of the percussive type, and upon opposite sides thereof are formed recesses 2 and resultant semi-circular walls 3, the forward ends thereof terminating in abutments 4. It will be of course understood that the walls and abutments are integral parts of the front head.

These abutments have their inner faces provided with seats 5 and 6, and intermediate shoulders 7, the terminals thereof constituting stops 8, the purpose of which will be later eX- plained. The retainer 9 is formedfrom suitable gagewire stock and is bent to provide a yoke 10 .to accommodate the drill steel *11,

but of such size as to prevent the passage of Vthe collar 12 therethrough when the rewalls 8. The terminals of the coils are formed to provided rounded lugs 15 for cooperation with the seats 5 and 6 and shoulders 7 in a manner to be hereinafter described. It

will be obvious that when the coils 14 are confined by the walls 3 that a pivotal connection is formed between the front head and retainer in Order that the retainer may conveniently be swung to its open or closed position,as' desired. rlhe inherent resiliency 0f the coils serves to hold the retainer in either its open or closed position.

As shown in full lines in Figure 1 the lugs 15 are engaged in the seats 5 and owing to the resiliency ofthe coils, said `lugs will be-iirmly maintained in said seats, thus holding the retainer in a position to locate the yoke 10 in advance of the collar 12 to arrest the outward 4movement of the drill steel when rapidly wWhen it is desired to remove the drill steel the retainer is swung to the position as shown in dotted lines in Figure 2, whereupon the coils will contract slightly and. the lugs 15 will disengage the seat 5 and move'into engagement with the shoulders 7 and at which time the side arms 13 will engage the stops 8. The yoke 10 will then be so positioned that the movement of the drill steel collar will not be arrested thereby, thus permittingthe drill steel to be removed.

To remove the retainer from the front head the side arms 13 are sprung apart a suiicient distance to clear the stops 8, and upon swinging` the retainer laterally the side arms engage the bases of the seats 6, atwhich time the coils are fully disengaged from the walls 3. It is then only necessary to eXert pressure upon the retainer to disengage the same. To replace the retainer the terminal lugs l5 are placed in the seats 6 and the retainer swung until the coils are confined by the Walls and the lugs againlengage theiseatsv.

Having thus described the finvention, I claim:

l. The combination with the front head of a drill having a collared 'drill steel operable therein, of Walls upon the opposite sides of the front head, said Walls terminating atene of their ends in abutments, a drill steel retainer comprising a yoke fand-side armsfthe inner ends of the side arms having coils for engagingthe :inner l,perip'heryfof the Walls, cooperative means `carried 'i-by Vthe terminals of the coils and abutments forholding the Iretainer with its'yoke in aposition to arrest the passage of the drill ysteel collar-therethrough 4or permit thenpassagewthereoff thereby.

2. The combination With theffrontfhead o'f a drill having-a oollared drill steel :o.peratively associated therewith,y .of Walls-upon opposite sides of the front head.y said Walls terminating at one of their ends inabutments,

said .abutments having spaced/Seats therein,

a drill steel retainer comprising a-yoke land side arms, the inner ends of the side arms having coils thereonand havlng termlnal lugs iside=ar1ns1havimg^their inner ends provided with open coils, said coils having intimate `sliding-engagement iwiththe Walls'to permit pivotal? .movement oflthe ffretailner, 'flugs upon 'the terminals of the coi'lsfor selective :engagement with the seats, as and for the purpose set forth.

The combination' 'with the front-head 'of Aa'Idri-ll, rof Wa-lils upon' opposite'- `sides` thereof, of sabutments-earried :by ythe walls, a 'drill steel retainer includingsidey armslhavingresilient coils upon thetenminalsiand@pivotally confined? by I the Walls, and means for i inter- -lockim the coils and fabutments 4.to hold v the `drill steel retainer iny operative vor inoperative position.

In testimonyV Wli-ereofI-aiix my signature.

@JOHN RENFE-R. 

